The science of environmental enrichment for pigs has advanced significantly over recent decades. Evidence clearly shows that appropriate enrichment dramatically improves pig welfare and reduces injurious behaviors in commercial systems.
The welfare science of pig enrichment is unusually clear: enrichment works, it works across diverse production systems, and even low-cost interventions produce measurable positive welfare outcomes. The challenge lies in translating evidence into practice across an industry where slatted flooring, automated feeding, and high throughput create barriers to traditional enrichment provision. Straw — the gold-standard enrichment — is incompatible with many slatted systems designed for automated slurry removal. Novel materials including enrichment boards, suspended ropes, and automated enrichment dispensers provide partial but not complete substitutes. The cost of enrichment must be weighed against the welfare and economic costs of tail biting — an injurious behavior that in uninenriched herds causes significant loss. Tail docking — routine in many countries to prevent tail biting consequences — is a painful mutilation that would become unnecessary if underlying enrichment needs were properly addressed. The EU requires that docking only be performed when enrichment and management changes have failed to prevent biting — a standard rarely enforced.